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Refraction

The twinkling...

Question

The twinkling of a star is due to ___________.

A

optical looming

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B

atmospheric refraction

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C

total internal reflection

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D

reflection

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Solution

The correct option is B atmospheric refraction
Light from the stars has to come the layer of atmosphere over Earth. The optical density profile of atmosphere keeps on changing. Hence, the amount of refraction due to atmosphere also keeps changing. Due to this, the apparent position of star keeps on shifting. This causes the twinkling of stars.

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